<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>

    var symb1 = Symbol();
    var symb2 = Symbol();
    console.log(typeof symb1);
    console.log(typeof symb2);
    console.log(symb1,symb2,symb1 === symb2);

    var symb3 = Symbol("foo");
    var symb4 = Symbol("bar");
    console.log(symb3,symb4,symb3 === symb4);

    var symb5 = Symbol("foo");
    var symb6 = Symbol("foo");
    console.log(symb5,symb6,symb5 === symb6);






</script>
</html>